**THIS      WARRANT HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF1933 (THE "ACT")      NOR      UNDER ANY STATE SECURITIES LAW AND MAY NOT BE PLEDGED, SOLD, ASSIGNED OR      OTHERWISE TRANSFERRED UNTIL (1) A REGISTRATION STATEMENT UNDER THE ACT AND      ANY      APPLICABLE STATE SECURITIES LAW HAS BECOME EFFECTIVE WITH RESPECT THERETO,      OR      (2)RECEIPT BY THE COMPANY OF AN OPINION OF COUNSEL TO THE COMPANY TO THE EFFECT      THAT REGISTRATION UNDER THE ACT OR APPLICABLE STATE SECURITIES LAW IS NOT      REQUIRED IN CONNECTION WITH THE PROPOSED TRANSFER.**

*SPECTRA*
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|  | (a) | EXERCISE                OF WARRANT. |
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|  | (b) | RESERVATION                OF SHARES. The Company shall at all times reserve for issuance and/or                delivery upon exercise of this Warrant such number of shares of its                Common                Stock as shall be required for issuance and delivery upon exercise                of the                Warrants. |
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|  | (c) | FRACTIONAL                SHARES. No fractional shares or scrip representing fractional shares                shall                be issued upon the exercise of this Warrant. With respect to any                fraction                of a share called for upon any exercise hereof, the Company shall                pay to                the Holder an amount in cash equal to such fraction multiplied by                the                current market value of a share, determined as                follows: |
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|   | (d) | EXCHANGE,                TRANSFER, ASSIGNMENT OR LOSS OF WARRANT. This Warrant is exchangeable,                without expense, at the option of the Holder, upon presentation and                surrender hereof to the Company for other warrants of different                denominations entitling the holder thereof to purchase in the aggregate                the same number of shares of Common Stock purchasable hereunder.                Upon                surrender of this Warrant to the Company at its principal office                with the                Assignment Form annexed hereto duly executed and funds sufficient                to pay                any transfer tax, the Company shall, without charge, execute and                deliver a                new Warrant in the name of the assignee named in such instrument                of                assignment and this Warrant shall promptly be cancelled. This Warrant                may                be divided or combined with other warrants which carry the same rights                upon presentation hereof at the principal office of the Company together                with a written notice specifying the names and denominations in which                new                Warrants are to be issued and signed by the Holder hereof. The term                "Warrant" as used herein includes any Warrants into which this Warrant                may                be divided or exchanged. Upon receipt by the Company of evidence                satisfactory to it of the loss, theft, destruction or mutilation                of this                Warrant, and (in the case of loss, theft or destruction) of reasonably                satisfactory indemnification, and upon surrender and cancellation                of this                Warrant, if mutilated, the Company will execute and deliver a new                Warrant                of like tenor and date. Any such new Warrant executed and delivered                shall                constitute an additional contractual obligation on the part of the                Company, whether or not this Warrant so lost, stolen, destroyed,                or                mutilated shall be at any time enforceable by                anyone. |
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|   | (e) | RIGHTS                OF THE HOLDER. The Holder shall not, by virtue hereof, be entitled                to any                rights of a shareholder in the Company, either at law or equity,                and the                rights of the Holder are limited to those expressed in the Warrant                and are                not enforceable against the Company except to the extent set forth                herein. |
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|   | (f) | ANTI-DILUTION                PROVISIONS. The Exercise Price in effect at any time and the number                and                kind of securities purchasable upon the exercise of the Warrants                shall be                subject to adjustment from time to time upon the happening of certain                events as follows: |
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|  | (1) | In                case the Company shall (i) declare a dividend or make a distribution                on                its outstanding shares of Common Stock in shares of Common Stock,                (ii)                subdivide or reclassify its outstanding shares of Common Stock into                a                greater number of shares, or (iii) combine or reclassify its outstanding                shares of Common Stock into a smaller number of shares, the Exercise                Price                in effect at the time of the record date for such dividend or distribution                or of the effective date of such subdivision, combination or                reclassification shall be adjusted so that the Exercise Price shall                be                proportionately increased (as in the case of (iii), above) or decreased                (as in the case of (i) or (ii), above). Such adjustment shall be                made                successively whenever any event listed above shall                occur. |
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|  | (2) | Whenever                the Exercise Price payable upon exercise of each Warrant is adjusted                pursuant to Subsections (1) above, the number of Shares purchasable                upon                exercise of this Warrant shall simultaneously be adjusted by multiplying                the number of Shares initially issuable upon exercise of this Warrant                by                the Exercise Price in effect on the date hereof and dividing the                product                so obtained by the Exercise Price, as                adjusted. |
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|  | (3) | No                adjustment in the Exercise Price shall be required unless such adjustment                would require an increase or decrease of at least two cents ($0.02)                in                such price; provided, however, that any adjustments which by reason                of                this Subsection (5) are not required to be made shall be carried                forward                and taken into account in and subsequent adjustment required to be                made                hereunder. All calculations under this Section (f) shall be made                to the                nearest cent or to the nearest one-hundredth of a share, as the case                may                be. Anything in this Section (f) to the contrary notwithstanding,                the                Company shall be entitled, but shall not be required, to make such                changes                in the Exercise Price, in addition to those required by this Section                (f),                as it shall determine, in its sole discretion, to be advisable in                order                that any dividend or distribution in shares of Common Stock, or any                subdivision, reclassification or combination of Common Stock, hereafter                made by the Company shall not result in any Federal income tax liability                to the holders of Common Stock or securities convertible into Common                or                Common Stock (including Warrants). |
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|  | (4) | Whenever                the Exercise Price is adjusted, as herein provided, the Company shall                promptly but no later than 20 days after any request for such an                adjustment by the Holder, cause a notice setting forth the adjusted                Exercise Price and adjusted number of Shares issuable upon exercise                of                each Warrant, and, if requested, information describing the transactions                giving rise to such adjustments, to be mailed to the Holder at his                last                address appearing in the Warrant Register, and shall cause a certified                copy thereof to be mailed to its transfer agent, if any. The Company                may                retain a firm of independent certified public accountants selected                by the                Board of Directors (who may be the regular accountants employed by                the                Company) to make any computation required by this Section (t), and                a                certificate signed by such firm shall be conclusive evidence of the                correctness of such adjustment. |
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|  | (5) | In                the event that at any time, as a result of an adjustment made pursuant                to                Subsection (1) above, the Holder of this Warrant thereafter shall                become                entitled to receive any shares of the Company, other than Common                Stock,                thereafter the number of such other shares so receivable upon exercise                of                this Warrant shall be subject to adjustment from time to time in                a manner                and on terms as nearly equivalent as practicable to the provisions                with                respect to the Common Stock contained in Subsections (1) to (4),                inclusive                above. |
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|  | (6) | Irrespective                of any adjustments in the Exercise Price or the number or kind of                shares                purchasable upon exercise of this Warrant, Warrants theretofore or                thereafter issued may continue to express the same price and number                and                kind of shares as are stated in the similar Warrants initially issuable                pursuant to this Agreement. |
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|   | (g) | OFFICER'S                CERTIFICATE. Whenever the Exercise Price shall be adjusted as required                by                the provisions of the foregoing Section, the Company shall forthwith                file                in the custody of its Secretary or an Assistant Secretary at its                principal                office an officer's certificate showing the adjusted Exercise Price                determined as herein provided, setting forth in reasonable detail                the                facts requiring such adjustment, including a statement of the number                of                additional shares of Common Stock, if any, and such other facts as                shall                be necessary to show the reason for and the manner of computing such                adjustment. Each such officer's certificate shall be made available                at all                reasonable times for inspection by the Holder or any holder of a                Warrant                executed and delivered pursuant to Section (a) and the Company shall,                forthwith after each such adjustment, mail a copy by certified mail                of                such certificate to the Holder or any such                holder. |
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|   | (h) | NOTICES                TO WARRANT HOLDERS. So long as this Warrant shall be outstanding,                (i) if                the Company shall pay any dividend or make any distribution upon                the                Common Stock or (ii) if the Company shall offer to the holders of                Common                Stock for subscription or purchase by them any share of any class                or any                other rights or (iii) if any capital reorganization of the Company,                reclassification of the capital stock of the Company, consolidation                or                merger of the Company with or into another corporation, sale, lease                or                transfer of all or substantially all of the property and assets of                the                Company to another corporation, or voluntary or involuntary dissolution,                liquidation or winding up of the Company shall be effected, then                in any                such case, the Company shall cause to be mailed by certified mail                to the                Holder, at least fifteen days prior to the date specified in (x)                or (y)                below, as the case may be, a notice containing a brief description                of the                proposed action and stating the date on which (x) a record is to                be taken                for the purpose of such dividend, distribution or rights, or (y)                such                reclassification, reorganization, consolidation, merger, conveyance,                lease, dissolution, liquidation or winding up is to take place and                the                date, if any is to be fixed, as of which the holders of Common Stock                or                other securities shall receive cash or other property deliverable                upon                such reclassification, reorganization, consolidation, merger, conveyance,                dissolution, liquidation or winding                up. |
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|   | (i) | RECLASSIFICATION,                REORGANIZATION OR MERGER. In case of any reclassification, capital                reorganization or other change of outstanding shares of Common Stock                of                the Company, or in case of any consolidation or merger of the Company                with                or into another corporation (other than a merger with a subsidiary                in                which merger the Company is the continuing corporation and which                does not                result in any reclassification, capital reorganization or other change                of                outstanding shares of Common Stock of the class issuable upon exercise                of                this Warrant) or in case of any sale, lease or conveyance to another                corporation of the property of the Company as an entirety, the Company                shall, as a condition precedent to such transaction, cause effective                provisions to be made so that the Holder shall have the right thereafter                by exercising this Warrant at any time prior to the expiration of                the                Warrant, to purchase the kind and amount of shares of stock and other                securities and property receivable upon such reclassification, capital                reorganization and other change, consolidation, merger, sale or conveyance                by a holder of the number of shares of Common Stock which might have                been                purchased upon exercise of this Warrant immediately prior to such                reclassification, change, consolidation, merger, sale or conveyance.                Any                such provision shall include provision for adjustments which shall                be as                nearly equivalent as may be practicable to the adjustments provided                for in                this Warrant. The foregoing provisions of this Section (i) shall                similarly                apply to successive reclassifications, capital reorganizations and                changes                of shares of Common Stock and to successive consolidations, mergers,                sales                or conveyances. In the event that in connection with any such capital                reorganization or reclassification, consolidation, merger, sale or                conveyance, additional shares of Common Stock shall be issued in                exchange,                conversion, substitution or payment, in whole or in part, for a security                of the Company other than Common Stock, any such issue shall be treated                as                an issue of Common Stock covered by the provisions of Subsection                (1) of                Section (f) hereof. |
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|   | (j) | REGISTRATION                UNDER THE SECURITIES ACT OF 1933. Until the expiry date of this Warrant,                the provisions of the Registration Rights Agreement dated as of even                date                herewith between the Holder of the Warrants and the Company shall                apply to                registration of the Warrant Shares. The Company's agreements with                respect                to Warrants or Warrant Shares in such Registration Rights Agreement                shall                continue in effect regardless of the exercise and surrender of this                Warrant. |
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|   | (k) | RESTRICTIVE                LEGEND. Each Warrant Share, when issued, shall include a legend in                substantially the following form: |
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|  Dated:              December 31, 2007 |                                  |         |
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|                                        |                                  |         |
|                                        | **SPECTRASCIENCE,              INC.** |
|                                   |                             |    |
| Attest:                                     | By:                         |              |
|  James              Hitchin            | James              Hitchin            |
|  Title:              Chairman and CEO  | Title:              Secretary         |

**PURCHASE      FORM**

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**INSTRUCTIONS      FOR REGISTRATION OF STOCK**

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**ASSIGNMENT      FORM**

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